Deathfire Touch and its Interaction With DOT

Deathfire Touch has been driving me insane since its release. I love the keystone, think it's fantastic, but the way it deals with DOT makes absolutely no sense.

Deathfire touch can deal damage on three different "classes" of abilities: AOE, DOT, and everything else. Mages with Damage Over Time (specifically ) are AMAZINGLY strong right now because I believe DFT does not work properly with them. With both an Area of Effect and DOT, DFT deals half damage over half the duration, which I am sure we are all aware. With AOE this makes sense, the ability to apply the keystone to multiple enemy players with a single ability requires that ability deal less damage, in this case HALF damage. However, if you divide the damage AND THE DURATION in half, the damage per second of the ability remains the same. Similarly 2/4 = 1/2. Our DPS is a measure of damage over time so dividing both by two keeps the value the same. For AOE the DPS being the same matters very little because the damage is cut in half, the duration from a single ability ends, and the damage stops. Damage Over Time abilities, however, continues to apply DFT over and over and over meaning that it doesn't MATTER what the duration of DFT is, all that matters is how much damage is being dealt each second. So when brand uses an ability, DFT gets applied over and over dealing the same amount of damage per second that it would for a normal ability, but instead of stopping at the normal 3 seconds, it gets reapplied until the ability damage has ended and THEN AND ONLY THEN do you get the "reduced" damage of having the duration only be for 1.5 seconds. Because Deathfire Touch continues to get reapplied, as it should, on Damage Over Time abilities, it needs to deal less damage per second. Shortening the duration of the ability means nothing when the duration is constantly refreshed. If the numbers were changed just so that the damage was cut in half without the duration changing ("Area of effect and damage over time abilities apply half of this damage over 3 seconds instead) the damage of DFT would remain the same for AOE abilities and would be cut in half for DOTs. This is why our DOT mages are so strong.

I hope this was clear XD It's been driving me nuts that no one had said anything about it other than "Brand is OP with DFT" because both of them together is a beautiful thing, the numbers just don't make any sense.

Also while I have you, can I just mention that DFT not applying on Darius passive makes no sense. Obviously he will be much much stronger if it does apply, but his passive works exactly like Brand's passive with a slight change on what causes it. It makes little sense for one to apply and not the other.